Hach sc100 1720E Instrument Manual

Contents

Hach sc100 1720E Instrument Manual Manual pdf 47 page image

47Section 6 MaintenanceDANGEROnly qualified personnel should conduct the maintenance tasks describedin this section of the manual.6.1 Maintenance ScheduleScheduled periodic maintenance requirements of the 1720E are minimal andinclude calibration and cleaning of the photocell window, bubble trap, and body.Check and clean the bubble trap and turbidimeter body (as described insection 6.4.3) if visual inspection shows that it is necessary. Perform othermaintenance on a regular basis; experience will dictate scheduling and maydepend on the installation, sample type, and season.It is very important to maintain the cleanliness of the interior and exterior of theturbidimeter body, head assembly, the integral bubble trap, and the surroundingarea. Doing so will ensure accurate, low-level turbidity measurements.Clean the body before calibration and verification (especially when measurementsare being made at 1.0 NTU or lower).Check and/or perform a calibration periodically (as experience dictates) using oneof the methods described in section 5.3 on page 40. A calibration history menuoption is available under Sensor Setup/Calibrate.6.2 Removing a Sensor from the SystemPrior to physically removing a sensor from the system, record all user definedsettings such as relays, signal averaging, etc. Disconnect the sensor connector atthe controller.6.3 Reinstalling a Sensor on the SystemTo return the system to normal operation following a software upgrade or sensorrepair perform the following procedure:1. Detach all sensors from the sc100 controller.2. From the main menu, press the down arrow key to highlight TEST/MAINT.Press ENTER.3. Use the down arrow key to scroll to SCAN SENSORS and press ENTER.4. Remove attached sensors by selecting the corresponding serial number orselect “All”.5. Power down the sc100 then attach the 1720E.Note: Clean sensors beforereinstallation on the system.6. Supply power to the sc100. The system will initialize automatically.Maintenance Task FrequencyClean the sensor Before each calibration and as needed. Depends on samplecharacteristics.Calibrate Sensor (as required by regulatory agency) Per agency-dictated schedule.